Frequency-sequence selector or frequency-determining apparatus for radiocircuits



Jan. 17, 1928. 1,656,520

M. JACQBSON FREQUENCY SEQUENCE SELECTOR QR FREQUENCY DETERMINING APPARATUS FOR RADIO CIRCUITS Filed Sept. 11. 1924 2 Sheets-Suez l INVENTOR. N10395- Jataasm 7 Afro/ME} Jan. 17, 1928.

M. JACOBSON FREQUENCY SEQUENCE SELECTOR OR FREQUEN APPARATUS FOR RADIO CIRCUIT Filed Sept. 11. 1.924

0 2 2 5 a 6 e n w mm 1N3 me m T2 E D W5 noses Jacobson ATTORNEY Patented Jan. 17, 1928.

UNITE STATES PATENT GFFICE.

MOSES JACOBSON, 01?

NE'VV YORK, 13'. "1 ASSIGNOB OF ONE-BALE TO VJILLLUYI A. SGHACET, 01 BROOKLYN, NEW YORK.

Application filed September My invention relates to improvements in means for changing the frequency of electromagnetic oscillations particularly in radiotransmitting and receiving circuits and it consists in the novel features hereinafter described.

One of the objects of my invention is to provide apparatuses whereby a predetermined sequence of frequencies may be automatically maintained for any desired length of time.

Another object of my invention is to provide means for readily and quickly changing from one combination of frequencies to another.

A further object of my invention is to provide a means for passing from one frequency to another on the sequence of frequencies in a predetermined way and in such a manner that on the one hand sudden changes will be avoided and on the other hand the passing through certain intermediate frequencies may be accomplished so quickly that interference with and from these frequencies may be avoided.

A still further object. of my invention is to have multiple capacity elements to interact with a single capacity element, also multiple inductance elements to interact with a single inductance element to produce a change of frequency in a radio receiving or transmitting system.

Other objects and advantages of my in vention will hereinafter appear.

A change in frequency may be obtained by changing either the capacity or the inductance of the circuit, or both capacity and inductance, and any apparatus. for changing the frequency must consist of either a variable condenser, or a varionieter or a combination of both. The preferred embodiment of my invention hereinafter described, consists of acombination of a special form of a condenser with a special form of variometer, but obviously in some cases parts of this combination may be used without the other parts.

In the drawings, Fig. 1 is a vertical section on the broken lines 11 of Figs. 2 and 3, showing some parts in elevation.

Fig. 2 is a sectional plan on the line 22 of Fig. 1, of the condenser part of the appa- 11, 1924. Serial No. 737,161.

ratus shown in Fig. 1, and showing the bolts as cut through at their shoulders.

Fig. 3 is a sectional plan on the line 3-3 of Fig. 1, of the variometer part of the apparatus shown in Fig. l, but showing the vertical spindles in plan view.

Fig. 4 is mainly a vertical section of a modification of the variometer part of my apparatus.

Similar characters of reference refer to similar parts throughout the several views:

11 and 12 designate a pair of discs of nonconducting material which are connected 6 and kept in position by the bolts 13, which are provided with shoulders at their ends as shown.

14 is a vertical shaft or spindle, which in one form of my apparatus may be operatively connected to an electric motor or some other source of power and normally kept rotating at a suitable velocity. The shaft 14 with the condenser plates 19 and coils 34, which are mounted thereon, form the rotary member or rotor of the said apparatus.

15, 16 and 17 are spindles of normally stationary members or stators, which may be adjusted in position by means of the said spindles, which are provided at their upper ends with the knurled knobs 23, 24 and the dials 25, 26. Stationary pointers 27 are shown as connected to the upper disc 12 by means of the rivets 28, to indicate on the dials 25, 26 the relative angular positions of the spindles 15, 16 and 17.

The metal condenser plates 19 preferably have the form of sectors, as shown in Fig. 2; the plates 19 may revolve between plates 20, 21, and 35 (see Fig. 2), which are carried by the stator spindles 15, 16 and 1.

The plates 19, 20, 21 and 35 are spaced from each other and from the disc 12 by means of the washers 22, as shown.

The stator plates 20, 21 and 35 preferably have the outline of spirals as shown in Fig. 2.

The lower parts of the spindles 14, 15, 16 and 17 may be made of nonconducting mate rial as shown in section in Fig. 1; the lower end of the rotor spindle 1 1 is shown in Figs. 1 and 3 as having mounted thereon the insulated core 38, which is encompassed by the coils 34, and the lower ends of the stator spindles 15, 16 and 17 have mounted thereon each various sizes of insulated wire and dif ferent numbers of turns of wire per inch, thereby providing different inductances.

In the modification shown in Fig. 4.- the relative shape of the stator cores 49, to the rotor core 53 is the reverse of that shown in Fig. 1; the coils 51 and 52 of the stators and the coils 54: of the roton of the vari* ometershown' in Fig. 4 conform to the shape of their respective cores.

The apparatus may be connected to the circuit through a suitable brush and commutator, which in this case may consist simply of a metal ring, and one of the wires 37 and rings 36' on one of'the-sta-torshafts as shown in the drawings. 7

Variations in frequency may be obtained and maintained by properly arranging the electrical connections of said stator and rotor plates, also of said statorand rotor coils of my apparatus. 7 Y

The operation of the said apparatus is as follows:

The stator elements having been set in a certain position, the limits, betweenwhich the capacity or inductance or both and thereby the frequency will vary, and the way of this variation, is thereby predetermined. It is obvious, that, even if therotor element will rotate comparatively slowly, the consecutive changes in the wave lengths may-be made by this apparatus to take place very rapidly, because the change of capacity and inductance in this apparatus depends to a very great degree upon the'shape and-number of the condenser plates, the size and the shape of the inductance coils and the relative position of the various elements. By a suitable combination of these elements it is also possible to make the changes in frequency,

when in the neighborhood of a certain number of desired frequencies, (in the apparatus as illustrated,of 3 frequencies) to take place comparatively slowly and to make them pass through other frequencies, with which interference is to be avoided, very rapidly. This feature makes the apparatus also very useful as a tuning unitin oscillating receiving circuits or in transmitting circults; the rotor in such cases not being con-' be made in the details of construction by 7 those skilled in the art. I

I do not therefore restrict myself either. to the special uses or" to the particular embodiment of my new invention ashereinbefore described, but I intend to include also all mechanical and electrical equivalents and obvious modifications of the same within the scope of the following claim.

I claim as -1ny invention and secure by Letters Patent:

In a frequency sequence selector a rotary shaft, carrying a set of condenser plates and an inductance coil, a multiplicity of shafts, which are stationary during the operation of the apparatus, situated symmetrically around said rotary shaft, said stationary shafts carrying each a set of condenser plates to interact with the rotary condenser plates and a set of inductancecoils of different inductance values to interact with the rotary inductance coil, the interactionof the stationary plates and coils with the rotary plates and coils being controlled by adjusting the positions of the respective stationary shafts, and means for connectingthe parts of the frequency sequence select-or with each other and with the circuit in such a manner asto include into the circuit the rotary elements and only those of the stationary elements at one time with which said rotary elements are to interact. I

Executed on the 10th day of September, 1924.

MOSES JACOBSON.

desire to 

